Perl! perl -e 'print [&lt;&gt;]-&gt;[int rand $.];' foo.txt

17 years ago

Perl! perl -e 'print [<>]->[int rand $.];' foo.txt

17 years ago

tail -$((RANDOM%`wc -l xephyr.sh | awk '{ print $1}'`)) xephyr.sh | head -1

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